#14373: Introduce PTR-tagging for big constructor families -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Currently only ''small'' constructor families come into the benefit of pointer tagging. In big fams, 1 is the tag that says "I am evaluated". I suggest to do best-effort pointer tagging on big families too by this scheme: Ptr-tag 1..6 for the first 6 constructors, 7 would signify "look into the info table and branch on that tag". In the info table the tags will then be 6..(familySize - 1). I have an implementation which I'll submit to fabricator soon. TODOs: update wiki pages. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14373 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler